Employee Benefit Plans Narrative (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) hour plan	Sep. 30, 2016 USD ($)	Jun. 30, 2012 USD ($) quarter	Jan. 05, 2015 USD ($)	Nov. 18, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans	2
Defined contribution plan, hours threshold for eligibility | hour	1,000
Defined contribution plan, employer matching contribution percent	50.00%
Defined contribution plan, employer matching contribution, percent of eligible income	6.00%
Defined contribution plan, employer matching contribution, annual vesting percent	20.00%
Defined contribution plan, vesting period	5 years
Defined contribution plan, automatic vesting age	65 years
Defined contribution plan, employee vesting percent	100.00%
Defined contribution plan, employer matching contribution | $	$ 500,000	$ 500,000
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon for long-term capital market assumptions	20 years
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon for long-term capital market assumptions	30 years
Labor Management Pension Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Withdrawal obligation | $	$ 4,000,000		$ 4,300,000	$ 4,900,000	$ 4,400,000
Multiemployer plan, quarterly installments for withdrawal liability | $			$ 91,000
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter			80
Other Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans	10
Multiemployer Plans, Pension | Multiemployer Plans, Defined Benefit Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans	2
Multiemployer Plans, Pension | Multiemployer Plans, Defined Contribution Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans	1